#include <stdio.h>
int main() {
int n=0;
float note=0;
float m=0;
while (note!=-1) {
scanf("%f\n",¬e);
n++;
m+=note;
}
if (m==-1)
printf("vous devez rentrer des notes !\n");
else {
float M=m/n;
printf("la moyenne est de %f\n",M);
}
}
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